``struct location''

``struct location''

[Andrew Cagney]

Hello,

This is a hunch.

I think there should be a ``struct location'' object to go with the 
``struct type'' object.  The ``struct value'' object would then be made 
of, the TYPE, LOCATION and, once the value has been read from memory, 
its VALUE.

This would make it possible for location expression evaluators and 
similar (e.g., unwind functions describing register locations) to return 
a ``location'' without any need to refer to types.

Having the location as an abstraction would also make it possible for 
GDB's ``location'' code to evolve independantly of the ``struct value'' 
- this is something we know we need since at present GDB can't describe 
things like values with a location that spreads across multiple 
registers and memory.

thoughts?
Andrew

Re: ``struct location''

[Daniel Berlin]

On Monday, July 8, 2002, at 10:59  PM, Andrew Cagney wrote:

> Hello,
>
> This is a hunch.
>
> I think there should be a ``struct location'' object to go with the 
> ``struct type'' object.  The ``struct value'' object would then be 
> made of, the TYPE, LOCATION and, once the value has been read from 
> memory, its VALUE.

>
> This would make it possible for location expression evaluators and 
> similar (e.g., unwind functions describing register locations) to 
> return a ``location'' without any need to refer to types.
>

> Having the location as an abstraction would also make it possible for 
> GDB's ``location'' code to evolve independantly of the ``struct 
> value'' - this is something we know we need since at present GDB can't 
> describe things like values with a location that spreads across 
> multiple registers and memory.
>


> thoughts?
>
Were you gone during April (seriously)?
Check the mailing list archives.

The whole loc_computed patch I submitted was the result of a discussion 
on how to do this.

that's what the struct location_funcs are meant to do.

"
/* A structure of function pointers describing the location of a
    variable, structure member, or structure base class.
"
> Andrew
>
>